第 4 集: 由紀在偷聽到玖蘭樞與學園長對話後，對Zero的秘密產生懷疑
2008年4月29日 播出
Seeing the state Yuuki is in, Kaname takes her from Zero, who is left speechless when he realizes what he has done. Yuuki cries in frustration, unaware of Zero's secret, even though they've known each other for a long time. Later, she overhears the conversation between the Headmaster and Kaname at the Headmaster's office. "In order to protect Zero..." After much consideration, Yuuki heads to the Moon Dormitory to ask a certain favour of Kaname. (Source: Vampire Knight Wiki)